Five former VNAF aircraft were transferred to the "Waterpump" training programme in May 1964. "Waterpump" was based at the RTAF base Udorn. The RT-28Bs, along with standard T-28 strike aircraft, were being replaced by A-1 Skyraiders in VNAF service. Five T-28s arrived as well. Of these ten aircraft, four were retained by "Waterpump" and the remaining six were transferred to the RLAF. The RT-28Bs were equipped with cameras, therefore providing the RLAF with a limited photo reconnaissance capability.